I test fitted one of my 20x10 rears on the front of my SRT Core the other day while I had it off replacing the rear tires.
I fit, it would not on the R/T charger that I had before.
I'm currently running 8.5 on the front with a 275/40/20
10 on the rear with a 315/35/20
When it comes time for a full set of tires I will be testing a 285/35/20 Rival on the front on a 10.
The car is also lowered on Eibach pro kit springs and sway bars.
Only rubbing experienced is with 4 adults and trunk loaded. Minor rolling of fender ans possible trimming of fender liner would remedy this.